People watch movies for entertainment so they would have a laugh. There are actually educational movies. There are movies for kids, those are educational to. Some movies talk about the past just much as the present. In my opinion movies are not ruining society. And there are people out there that would agree with me.
There are many different types of movies. Some movies make you laugh, cry, feel and think. Some movies make you zone out as you watch expensive CG explosions. Some movies are filled with violence. Every movie is different. Some movies may influence some people negatively, but you will get that with many different forms of entertainment.